|   Study  |       Bulk density (g/cm3)  |       Sand type  |       Location  |    
|   A [36]  |       1.64  |       Medium sand  |       Amazon river  |    
|   B [15]  |       1.65  |       Fine to medium sand  |       Mississippi river Nile  |    
|   C [37]  |       1.68  |       Fine sand  |       River  |    
|   D [38]  |       1.72  |       Fine to medium sand  |       Danube river  |